—I hear Jane has gone to the Holy Island for her holiday.

—Oh, how nice! Do you know when she ________?

A．was leaving

B．had left

C．has left

D．left

NB/T47013.3-2015标准规定，如果涉及到不同工件厚度对接接头的检测，试块厚度的选择应由其平均厚度来确定。